diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index dbfa55553..44f75242f 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -7530,6 +7530,8 @@ void Tokenizer::simplifyEnum()
             for (; tok1 && tok1 != end; tok1 = tok1->next()) {
                 if (tok1->str() == "(") {
                     tok1 = tok1->link();
+					if (!tok1)
+						syntaxError(nullptr); // #6909
                     continue;
                 }
 
diff --git a/test/testgarbage.cpp b/test/testgarbage.cpp
index 58c45ac20..a1778283a 100644
--- a/test/testgarbage.cpp
+++ b/test/testgarbage.cpp
@@ -151,6 +151,7 @@ private:
         TEST_CASE(garbageCode109);
         TEST_CASE(garbageCode110);
         TEST_CASE(garbageCode111);
+		TEST_CASE(garbageCode112);
 
         TEST_CASE(garbageValueFlow);
         TEST_CASE(garbageSymbolDatabase);
@@ -849,6 +850,10 @@ private:
         ASSERT_THROW(checkCode("enum { FOO = 1( ,) } {{ FOO }} ;"), InternalError);
     }
 
+	void garbageCode112() { //  #6909
+        ASSERT_THROW(checkCode("enum { FOO = ( , ) } {{ }}>> enum { FOO< = ( ) } { { } } ;"), InternalError);
+    }
+
 
 
     void garbageValueFlow() {